<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
        <h1>3.html</h1>

        <a href="2.html">test1</a>
        <a href="2.html" target="f4">test2</a>
        <a href="javascript:;" onclick="window.parent.location='2.html'">test3</a>
    </body>
</html>